this morning, suspected bomber dzhokhar tsarnaev's condition is said to be improving. he's been upgraded from serious to fair condition. he still could be moved out of beth israel deaconess medical center to another facility. dr. sanjay gupta is with us today. he is back in new york. sanjay, we hear fair condition. what exactly does that mean? >> you know, these terms can be a little bit subjective, john. but basically what it means is that the vital signs that they've been monitoring for him are stable, and they're staying stable. when someone is in serious condition he may have vital stable signs but you still worry that they may become unstable sometimes. the patient is typically in the intensive care unit. in more of a lay perspective it sort of means that look, the injury that he sustained no longer considered life threatening. it's not to say that doctors still don't worry about things like infection, and the rest of his hospitalization. but it's sort of out of the woods from those initial injuries, john. >> we're also hearing, sanjay, that he may be moved soon t